The model of the atom has changed over time in light of new knowledge and discoveries. which option correctly describes one such change? a. about 1915, jj. thompson developed an atomic model where negatively charged particles orbit a positively charged nucleus. b. about 1990, jj. thompson discovered electrons were negatively charged particles. c. in 420 b. c., john dalton developed the idea that small atoms combined to form molecules. d. about 1900, neils bohr developed an atomic model where positively charged particles orbit a negatively charged nucleus.

The material that keeps its new shape after it is stretched is called?

Click the game tab at the bottom of the simulation and select level 1. (there is no seesaw balance for this part of the activity.) balance the first equation, and click check to see if you got it right. if you can’t balance it in the first try, you can try again. work through the five equations for level 1. click continue to go on to level 2, and later level 3. each level is more difficult than the one before. keep trying until all the equations are balanced. in one or two sentences, describe how you did in the balancing game. in a few more sentences, explain one strategy you learned for balancing more complex equations.

What happens when the vapor pressure of a liquid is equal to the external pressure?